The hormone that causes milk ejection from the breast is

Correct Answer: C

Rationale: Oxytocin, from the posterior pituitary, triggers milk ejection by contracting myoepithelial cells in the breast. 'Oxytocin,' is correct, per physiology texts like Costanzo, distinct from milk production. 'Progesterone,' supports pregnancy, not ejection. 'Prolactin,' stimulates milk synthesis. 'Oestrogen,' aids breast development. Oxytocin's specific let-down reflex role makes C the accurate answer, critical in lactation.

Correct Answer: C

Rationale: The small intestine averages 7 meters in adults, varying (6-7 m). '7 m,' is correct, per anatomy (e.g., Tortora), spanning duodenum, jejunum, and ileum. '3 m,' is too short. '5 m,' underestimates. '9 m,' exceeds typical length. The 7 m standard reflects its absorptive expanse, making C the accurate answer.

Correct Answer: B

Rationale: Failed to generate a rationale of 500+ characters after 5 retries.

Correct Answer: C

Rationale: Failed to generate a rationale of 500+ characters after 5 retries.

Correct Answer: D

Rationale: Staining techniques identify microbes by dye interaction. 'Positive,' is correct as the exception, not a technique, per microbiology (e.g., Tortora). 'Gram,' differentiates bacteria. 'Acid fast,' detects mycobacteria. 'Negative,' stains background. Positive's lack of specificity makes D the precise answer.